Add ability to easily contact groups of drivers from dispatch number

[smarbin]

e.g. you have been inactive for 30+ min, please check your app for new rides near you, etc.

[dryan]

Rather than making this a manual task, just do a recurring task that sends a text when any riders are overdue for assignment to everyone within X miles of those riders.

[john]

Took the liberty of editing the title from "easily text" to "easily contact," because this sounds like a great use case for native notifications, which offer many advantages over texting.